W. G.  Van Name, ?The ascidians of the Bermuda Islands?, Transactions of the Connecticut Academy of Arts and Sciences, vol. 11, pp. 325-412, 1902.

W. A.  Herdman, ?Tunicata?, In Report on the collections of natural history made in the Antarctic regions during the voyage of the Southern Cross (British Museum Natural History) & E.R. Lankester. London, vol. 6, pp. 190-200, 1902.